// Class diagram AST structures based on classDiagram.jison
package ast

// ClassDiagram represents a class diagram
type ClassDiagram struct {
	Classes   map[string]*ClassNode `json:"classes"`
	Relations []*ClassRelation      `json:"relations"`
	ClassDefs map[string]*ClassDef  `json:"classDefs"`
	Notes     []*ClassNote          `json:"notes,omitempty"`
	Direction string                `json:"direction,omitempty"`
	Title     *string               `json:"title,omitempty"`
	Config    map[string]any        `json:"config,omitempty"`
}

type ClassNode struct {
	ID          string         `json:"id"`
	Label       string         `json:"label"`
	Type        ClassType      `json:"type"`
	Members     []*ClassMember `json:"members"`
	Methods     []*ClassMethod `json:"methods"`
	Annotations []string       `json:"annotations,omitempty"`
	Link        *string        `json:"link,omitempty"`
	LinkTarget  *string        `json:"linkTarget,omitempty"`
	Tooltip     *string        `json:"tooltip,omitempty"`
	CssClasses  []string       `json:"cssClasses,omitempty"`
}

type ClassType string

const (
	ClassTypeClass     ClassType = "class"
	ClassTypeInterface ClassType = "interface"
	ClassTypeEnum      ClassType = "enumeration"
	ClassTypeAbstract  ClassType = "abstract"
)

type ClassMember struct {
	Name       string           `json:"name"`
	Type       string           `json:"type"`
	Generics   []*Generic       `json:"generics,omitempty"`
	Visibility MemberVisibility `json:"visibility"`
	Classifier *string          `json:"classifier,omitempty"` // static, abstract
}

type ClassMethod struct {
	Name       string           `json:"name"`
	Type       string           `json:"type"`
	Generics   []*Generic       `json:"generics,omitempty"`
	Parameters []string         `json:"parameters,omitempty"`
	Visibility MemberVisibility `json:"visibility"`
	Classifier *string          `json:"classifier,omitempty"` // static, abstract
}

type MemberVisibility string

const (
	VisibilityPublic    MemberVisibility = "+"
	VisibilityPrivate   MemberVisibility = "-"
	VisibilityProtected MemberVisibility = "#"
	VisibilityPackage   MemberVisibility = "~"
)

type ClassRelation struct {
	From        string            `json:"from"`
	To          string            `json:"to"`
	Type        ClassRelationType `json:"type"`
	Label       *string           `json:"label,omitempty"`
	Cardinality *ClassCardinality `json:"cardinality,omitempty"`
}

type ClassRelationType string

const (
	RelationInheritance ClassRelationType = "inheritance" // --|>
	RelationComposition ClassRelationType = "composition" // --*
	RelationAggregation ClassRelationType = "aggregation" // --o
	RelationAssociation ClassRelationType = "association" // -->
	RelationRealization ClassRelationType = "realization" // ..|>
	RelationDependency  ClassRelationType = "dependency"  // ..>
)

type ClassCardinality struct {
	From string `json:"from,omitempty"`
	To   string `json:"to,omitempty"`
}

// ClassNote represents a note annotation
type ClassNote struct {
	ID       string    `json:"id,omitempty"`
	ForClass *string   `json:"forClass,omitempty"`
	Text     string    `json:"text"`
	Position NotePlace `json:"position,omitempty"`
}

// Generic represents a generic type parameter
type Generic struct {
	Name       string     `json:"name"`
	Constraint *string    `json:"constraint,omitempty"`
	Arguments  []*Generic `json:"arguments,omitempty"`
}

// ClickEvent represents a click interaction
type ClickEvent struct {
	NodeID   string  `json:"nodeId"`
	Callback *string `json:"callback,omitempty"`
	Link     *string `json:"link,omitempty"`
	Target   *string `json:"target,omitempty"`
	Tooltip  *string `json:"tooltip,omitempty"`
}

type ClassDef struct {
	ID     string   `json:"id"`
	Styles []string `json:"styles"`
}

// Type returns the diagram type
func (c *ClassDiagram) Type() DiagramType {
	return DiagramTypeClassDiagram
}

// Validate checks if the class diagram is valid
func (c *ClassDiagram) Validate() error {
	// Validate relations reference valid classes
	for _, rel := range c.Relations {
		if _, exists := c.Classes[rel.From]; !exists {
			return NewValidationError("relation references non-existent class: " + rel.From)
		}
		if _, exists := c.Classes[rel.To]; !exists {
			return NewValidationError("relation references non-existent class: " + rel.To)
		}
	}
	return nil
}

// NewClassDiagram creates a new class diagram
func NewClassDiagram() *ClassDiagram {
	return &ClassDiagram{
		Classes:   make(map[string]*ClassNode),
		Relations: make([]*ClassRelation, 0),
		ClassDefs: make(map[string]*ClassDef),
		Notes:     make([]*ClassNote, 0),
		Config:    make(map[string]any),
	}
}